third_party/liblouis/liblouis_list_tables.py

   1 #!/usr/bin/env python
   2 # Copyright 2013 The Chromium Authors. All rights reserved.
   3 # Use of this source code is governed by a BSD-style license that can be
   4 # found in the LICENSE file.
   5
   6 import os
   7 import re
   8 import sys
   9
  10 import json
  11 import optparse
  12
  13 # Matches the include statement in the braille table files.
  14 INCLUDE_RE = re.compile(r"^\s*include\s+([^#\s]+)")
  15
  16
  17 def Error(msg):
  18   print >> sys.stderr, 'liblouis_list_tables: %s' % msg
  19   sys.exit(1)
  20
  21
  22 def ToNativePath(pathname):
  23   return os.path.sep.join(pathname.split('/'))
  24
  25
  26 def LoadTablesFile(filename):
  27   with open(ToNativePath(filename), 'r') as fh:
  28     return json.load(fh)
  29
  30
  31 def FindFile(filename, directories):
  32   for d in directories:
  33     fullname = '/'.join([d, filename])
  34     if os.path.isfile(ToNativePath(fullname)):
  35       return fullname
  36   Error('File not found: %s' % filename)
  37
  38
  39 def GetIncludeFiles(filename):
  40   result = []
  41   with open(ToNativePath(filename), 'r') as fh:
  42     for line in fh.xreadlines():
  43       match = INCLUDE_RE.match(line)
  44       if match:
  45         result.append(match.group(1))
  46   return result
  47
  48
  49 def ProcessFile(output_set, filename, directories):
  50   fullname = FindFile(filename, directories)
  51   if fullname in output_set:
  52     return
  53   output_set.add(fullname)
  54   for include_file in GetIncludeFiles(fullname):
  55     ProcessFile(output_set, include_file, directories)
  56
  57
  58 def DoMain(argv):
  59   "Entry point for gyp's pymod_do_main command."
  60   parser = optparse.OptionParser()
  61   # Give a clearer error message when this is used as a module.
  62   parser.prog = 'liblouis_list_tables'
  63   parser.set_usage('usage: %prog [options] listfile')
  64   parser.add_option('-D', '--directory', dest='directories',
  65                     action='append', help='Where to search for table files')
  66   (options, args) = parser.parse_args(argv)
  67
  68   if len(args) != 1:
  69     parser.error('Expecting exactly one argument')
  70   if not options.directories:
  71     parser.error('At least one --directory option must be specified')
  72
  73   tables = LoadTablesFile(args[0])
  74   output_set = set()
  75   for table in tables:
  76     ProcessFile(output_set, table['fileName'], options.directories)
  77   return '\n'.join(output_set)
  78
  79
  80 def main(argv):
  81   print DoMain(argv[1:])
  82
  83
  84 if __name__ == '__main__':
  85   try:
  86     sys.exit(main(sys.argv))
  87   except KeyboardInterrupt:
  88     Error('interrupted')